Experimental Study On Mechanical Properties And Microstructure Of Aluminum-based Alloy Vacuum Suction

At present,more and more aluminum-based alloys are used in aerospace,automotive electronics and industrial equipment,etc.Vacuum suction casting process can significantly improve the microstructure and properties of castings,so exploring the mechanical properties and microstructure of aluminum alloy vacuum suction casting is imminent.Based on the material science,our research group designed a group of silicon and manganese co-added to the aluminum-based alloy experiment,the use of vacuum suction casting method to study the microstructure of the aluminum-based alloy under an electron scanning microscope,universal tensile machine Tensile properties and micro-hardness in the micro-hardness tester.The effect of vacuum process parameters on the aluminum-based alloys was studied by finite element simulation of Al-4.5Cu-1(Si-Mn)aluminum alloy with good mechanical properties.The microstructure,tensile stress,elongation and microhardness of the aluminumbased alloy performance research and analysis and numerical simulation of the vacuum suction casting Al-4.5Cu-1(Si-Mn)alloy casting process parameters Temperature,suction diameter,pouring speed and other research and analysis,concluded:(1)With the increase of silicon and manganese content,the microstructure of the aluminum-based alloy shows irregular lamellar structure,and finally the solid solution coexists with the irregular lamellar structure.When the content of Si and Mn in Al-based alloy is 1wt.%,The tensile stress of the alloy is the highest,reaching 205.87 MPa.When the content of Si and Mn in aluminumbased alloy is 2wt.%,The tensile stress of the alloy is the lowest,reaching 146.65MPa;and the minimum hardness of the alloy is 60.2HV.When the content of Si and Mn in Al-based alloy is 3wt.%,The elongation of the alloy is the lowest,reaching 18.96%.The hardness of the alloy is the highest,reaching 89.4HV.From the microstructure and mechanical properties of a comprehensive study found that aluminum-based alloy irregular sheet laminated structure will reduce its tensile stress,and solid solution will enhance its microhardness and tensile properties,reduce the elongation.(2)The state of vacuum suction casting simulated by gravity and pressure difference from the top to the bottom during the filling process of alloy solution shows some turbulent phenomena in the filling process.After the filling of the casting is completed,the heat of the super-alloy solution is continuously transmitted to the surroundings,and the temperature of the casting solution gradually decreases until it is completely solidified.Casting defects prone to the center of the specimen rod,forming shrinkage,shrinkage and other defects.Select casting temperature,pouring port diameter and casting speed as the three factors that affect the test results,select the shrinkage of castings and effective stress as an assessment index,the orthogonal test analysis.When the pouring temperature is 700?,the pouring gate diameter is 2.5mm and the pouring speed is 0.005 kg / s,the better Al-4.5Cu-1(Si-Mn)alloy can be obtained by vacuum suction casting.The maximum shrinkage value of 21.3%,the maximum effective stress of 100.3MPa.